Truck for railroad vehicles



P. C. WITHROW TRUCK FOR RAILROAD VEHICLES Filed Oct. l, 1923 wTNEssEs FGW Patented ct. 2l, 1924.

rAUL Q wrTi-iaow, or nnivvnn, Coton/Aro.

TRUCK FOR RAILIB/AID VEHICLES.

Application led October 1, 1923. Serial No. 665,980.

.To 'aZZaU'Lom t may cof/zoem.'

Be it known that-, PAUL C. l/Vrri-now,

a citizen of the United States, and a resi-- Vder date of April 29, 1913.

The object of my invention is to provide means, of simple and inexpensive construction, and ready applicability in trucks of the class to which it relates, whereby the 4movement of the swing bolster, while positively coincident with that of the supporting rockers, shall be rendered perfectly free in a vertical direction. f

The improvement claimed is hereinafter fully set forth.

ln the accompanying drawings: Figure 1 is a vertical transverse section through a four wheeled locomotive truck, illustrating an application of my invention therein; Fig. 2, a partial similar section, on an enlarged scale; Fig. 3, a horizontal section, on the line a a of Fig. 2; Fig. 4, a side view, in elevation, of a rocker; and, Fig. 5,-an enlarged side view of one end thereof, with connecting links in section.

My invention is herein exemplified as applied in a four wheeled locomotive truck of the swing or lateral motion type, in which, as in present practice, a frame, 1, is supported, through the intermediation of springs, 11, on the journal boxes, t, of axles, 5, on which the truckwheels, 5a, are secured. A swing frame or bolster support, 6, extends from one to the other of the side members of the truck frame, to which it is rigidly secured, at its ends. The weight carried by the truck is primarily .applied thereto through a floating or swing bolster, 7, which is provided with aI centre plate, 7a, perforated for the passage of a centre pin. The bolster is supported, with the capacity of relative lateral movement, on cam rockers, as hereinafter described.

In the practice of my invention, referring descriptively to the specific embodiment thereof which is herein exemplified, each of the ends of the bolster, 7, is, as in Letters Patent No. 1,060,222 aforesaid, supported on arocker, indicated, as a whole, by the reference character, 9. Each of the rockers comprises a body,'9b, which extends ,transversely to the bottom, two cam arms, 9,proi j ectiiig upwardly from the ends of the body, and having curved cam faces, and twocoiinection arms, 9S, similarly projecting from the body, and spaced at shortdistances from the inner sides of the rocker arms. Jour--VY nals, 9d,dare formed on the bottoms of the rockers, at each side thereof, each rocker being'adapted to swing, in either direction, on

one ory the other of its journals, vin theAV traverse thereof on inclined bearings, 6a,"

formed on the bolster support, 6.y Rollers, 9f, are also mounted' on the rockers, concentrically with the journals, 9d, said rollers traversing, in the swinging movements of the rockers, on the plane surface of the bottom of the bolster support.

Two oppositely inclined bearings, 7b, eX- i tending, in line, transversely to the frame members, 1, are formed in the bottom of the bolster, on each side of the longitudinal central plane of the truck, said bearings being faced with wear plates, 7, and being in line with thel cam arms, 9c, ofthe rockers, on which theyare supported. -The rockers, 9,

are connected, one to the other, by pairs of links, 8, each pair being coupled by pins, 8a, to the connection arms, 96,'of the rockersr standing in line transversely on the truck,

as-shown iii Figs. 3 andl 5. Rollers, 8b, journalled in the links, 8, abut on arms', 7d,`fproi jecting downwardly fromthe -swing bolster,

7, and fitting between the members ofy thel pairs of links, lateral movement lbeing' transmitted, through said arms, from the bolster to the rockers. Y v Y In the operation of a truck in which my invention is applied, vlateral movement is imparted to the ,-bolster, from the truck support to the bolster, and fromthe bolster ice frame and bolster'support, through the coincideiitly swinging rockers, 9, the connecting links, 8, and the arms,'7d, and the reverse movement of the bolster permitted, without impairing the 'freedom of vertical. movement of the bolster, as the` arms, "7"; thereof, while following the swinging movements of the rockers, slide freely vertically on the rollers,8b, of the links.

In the truck set forth in Patent No,

1,060,222, aforesaid, the rockers are coupled to the swing bolster by links extending in opposite direc-tions, vso that the connection ot' each rocker to th-e bolster, is effected on the side of the longitudinal central plane of the truck, further from -said rocker. rIhis construction has failed to loe fully satisfactory in practice, for the reason that the lateral movement of the bolster, causes all points on the rocker to move on a radius struck from the axis of the swinging movement ol the rocker, While the bolster moves vertically, due to its inclined bearing on the rocker. The links connecting therockers to the bolster, While causing the bolster to occupy a ixed'relative position, when normally central, do not efiect lthe saine relative position, when the bolster has moved laterally, as the Vlink connections oftherocker and bolster have not moved in .the same plane. The rocker connection to .the link has moved on .i radius from the axis of swinging movement, While the bolster connection to the link has moved upwardly, causing a swing in the link anda consequent shortening of its distance between centres, which .necessarily results in a slip between the rocker and its bearing on the bolster.

The objectionable result above indicated, is eliminated i-n the'practical operation of my invention, in Whicheach rocker is, as hereinbefore described, provided with two upwardly extending ar-ms, :disposed laterally opposite each other, and spacedV sufficiently far apart, longitudinally, to provide clearance for the centre pin. The Aarms or one rocker are, -as shown, connected to those opposite on the other-rocker, by continuous links, extending from sideto side, and carrying rollers, having a vertically slidable core tact with downwardly projecting arms on the bottom of the bolster centre plate,vso that the movement ofthe bolster, While posif tively coincident with the `swinging movement of the rockers, is entirely tree in a vertical direction.

I claim as my invention and desire to secure by Letters Patent:

l. In a railroad truck, -the combination olf a frame; Va bolster, adapted Vto traverse laterally relatively thereto; rockers, curnalled in bearings on the frame, extending-#transversely to said bolster, saidrockers having oppositely curved cam surfaces, Ialnitting against reversely inclined bearings on the bolster; land connections, directly coupling said rockers one to .the other.

"2. In a railroad truck, the combination ot' a frame; a bolster, adapted to traverse laterally Vrelatively thereto; rockers, journalled in bearings on the frame, extending transversely to said bolster, .said rockers having oppositeiy curved cam surfaces, abutting .against reversely inclined bearings on the bolster; connections, directly coupling said rockers one to the other; and connections, coupling the rockers to the bolster with the 4capacity of :tree Avertical movement of the bolster.

3. In a railroad truck, the combination of a frame; a bolster, adapted to traverse lat elally, relatively thereto; rockers, journalled in bearings on the trame, extending transversely to said bolster, said rockers having roppositely curved cam surfaces .abutting against reversely inclined bear-ings on the bols-ter; and links, directly coupling said rockers one to the other.

a. In a railroad truck, the combination ci a frame; a bolster, adapted to traverse laterally relatively thereto,;-rockers, onrnalled in bearings on the frame, vertending transversely to said .bolster,-said rockers having oppositely curved calm surfaces, abutting against reversely inclined bearings ou the bolster; links, directly coupling said rockers one to the other; Aand connections, coupling said links to the bolster., Wit-li the capacity of Jtree vertical movement of the bolster.

5. In a railroad truck, the combination ot a frame; a bolster, Ladapted to-traverse laterally relatively thereto; arms, projecting downwardly from the bolster, in the longitudinal central plane of the truck, and in parallel transverse planes thereof; rockers, journalled in bearings on the frame, Vextending transversely to sai-d bolster, said rockers having oppositely curved cam surfaces, abutting against reversely inclined bearings on the bolster; and links, directly coupling said rockers oneto the other; andproviding bearings `on which the downwardly projecting arms of the lbolster abut, in each direc tion of its inovemenu :and are free to slide vertically.

6. In a railroad truck, the combination ot a frame; a bolster, adapted toi traverse laterally relatively thereto; arms, projecting downwardly from the bolster, inthe longitudinal central plane of the truck and in parallel transverse planes thereof; rockers, journalled in bearings Vonthe frame, said rockers having oppositely curved cam surA faces, abutting against reversely inclined bearings on the bolster, and intermediate connection arms; links, coupling the connection arms of the rockers; vand rollers, journalled in said links and bearing on opposite sides :of the bolster arms.

PAUL C. WITHRGI. IlVitnesses S. RBonsoN,

H. L. Fonnrar. 

